PRAM Battery: 3.6V lithium (Maxell ER3S, Radio Shack 23-026)
Minutiae:
Upgraded four SIMMs at a time.
This machine contains a special motherboard slot which may be converted into a NuBus or a PDS slot by using an appropriate adaptor. Some 3rd party adaptors include a second slot for Cache cards, an FPU, and various other options.
Serial Port with the phone icon supports synchronous modems, with handshaking on both the output and input.